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m₁v₁=m₂v₂
v₁=m₂v₂/m₁
v₁=0,01kg×800m/s:4kg
v₁=2m/s
m1=4kg
m2=0,01kg
v1=?
v2=800m/s
m1*v1=m2*v2
v1=(0,01*800)/4
v1=2m/s